ALL guns have teething problems and can have problems if ammo spec is changed during the service life of the gun. These stories get kicked around after somebody reads a half chapter in a history book and then promptly falls alsleep before they read up to the solution.

I collected GP's for years, never had any locking problems. But...

I believe the problems you refer to are actually some problems associated with very high pressure UK service loadings that did pre-MKII pistols {including Inglis'} no good. Thus, the MKII and MKIII pistols.

Several excellent books have been written, see Collector Grade Publications.

Remember, BHP's have seen numerous changes over the years from their inception in the late '30's, thru WW2 made German guns, to postwar series and then the variations until the MK2 and MKIII pistols of the 80's-late 90's.

I only own one now, a shoulder-stocked, 1973-commercial job.